Not feeling calm or peaceful, or not firmly established and still in question.
Combination of prefix 'un-' (not) and 'settled,' which comes from Old English 'setl' meaning seat or dwelling place. Originally meant 'not having a fixed home,' later expanded to emotional meanings.
The word captures something fascinating about human psychology—we use physical/spatial language ('settled,' 'unsettled') to describe emotional states because our brains think of emotions through the lens of body and space.
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